American Airlines has round-trip flights from Austin (AUS) to New Orleans, Saint Louis, and San Diego (MSY, STL, SAN) for $118-$158, NONSTOP. Flights October to February. Extended weekends available. Origin/Destination reversible. Holiday blackouts.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Click for more details and booking links Nonstop Flights: Austin to/from New Orleans, Saint Louis, and San Diego $118-$158 r/t [October-February] (No Holidays) – American Airlines